JPH0380433B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a structure in which a large number of strip-shaped driving pieces are protruded from a base, the other ends of which are selectively curved greatly by the application of a voltage. It is applied to mechanical signal sources, information transmission devices, etc.

(Prior Art) It is known that a mechanical signal source is obtained by arranging a large number of strip-shaped piezoelectric elements, one end of which is fixed and the other end of which is largely curved by applying a voltage, and selectively driven. However, in the past, a large number of strip-shaped piezoelectric elements were manufactured separately and one end of the piezoelectric elements was fixed on a base, which required a large number of man-hours to assemble and it was difficult to obtain dimensional accuracy.

(Problems to be Solved) The present invention improves the above-mentioned man-hours and dimensional accuracy by protruding a large number of rectangular piezoelectric elements from a single base.

[Structure of the invention]

(Means for solving the problem) The problem was solved by protruding a large number of strip-shaped piezoelectric elements from one base and selectively driving the protruding piezoelectric elements.

(Example) FIG. 1 shows a basic embodiment of a comb-shaped piezoelectric drive device of the present invention, and the piezoelectric drive device 1 has metalized electrode surfaces 111a, 111a' and 111b, 111b on both main surfaces by silver vapor deposition or the like. It is made up of a bimorph structure in which a pair of piezoelectric ceramic thin plates 11a and 11b made of a polarized lead zirconate titanate-based compound are laminated via a shim 12 made of a thin plate of an elastic metal such as brass. In this structure, a plurality of drive pieces 1b _-1 , 1b _-2 , 1b _{-3 .} 1b _-1 , 1b _-2 , 1b _-3 ...
The metallized surface 111a exposed on the top layer of 1b _-o is
A drive piece 1b _-1 protruding forward from the base 1a,
1b _-2 , 1b _-3 . . . 1b _-o are driven independently, so the drive pieces 1b -1 , 1b _-1 are mounted on the base.
1b _-2 , 1b _-3 . . . A plurality of metallized surfaces 111a _-1 , 11 are cut out and divided into band shapes along 1b _-o , and are divided into band shapes on the base 1a.
Connect the lead wires _{1c -1 ,} 1c _-2 , 1c -3 ... 1c _-o to 1a _-2 , 111a _-3 ...111a _-o , respectively, by brazing, etc., and connect the common wires corresponding to these lead wires. Connect the lead wire 1d to the metallized electrode surface 111b' formed on the entire surface of the bottom layer, and connect the lead wire 1d and the above lead wires 1c _-1 , 1c _-2 , 1c _-3 . . . 1c _-o. A drive circuit (not shown) for selectively applying a high voltage to the drive piece is configured, and the lowermost metallized electrode surface 111b' is bonded and fixed to the base 2 on the base 1a side to receive a high voltage. The other end is bent and a small protrusion (not shown) is implanted directly or at the tip to serve as a mechanical signal source such as a relay.

Note that in this example, a plurality of driving pieces 1b _-1 , 1
b _-2 , 1b _-3 . . . 1b _-o In order to drive independently, the notch in the metallized surface 111a of the uppermost layer is formed in the shape of a band along each of the driving surfaces. The top layer metallized electrode surfaces are insulated from each other, so the metallized electrode in the area that connects the end of the base to the end of each drive piece, or a line that extends slightly forward beyond the end of each drive piece. You can also delete faces.
In addition, when a conductive material such as a metal is used for the base 2 that contacts and sits on the base 1a, the lowest layer metallized electrode surface 1
The common lead wire 1d connected to 11b' is connected to the board 2.
Furthermore, instead of the bimorph structure shown in the figure, a thin piezoelectric ceramic plate may be used as the metallized electrode surface, and each of the comb-shaped protrusions on one main surface may be connected to the metalized electrode surface as in the previous example. A monomorph structure is adopted in which a band-shaped notch is provided along the drive piece so as to cover the entire surface of the other main surface, and then a thin elastic metal plate is attached to the other main surface for reinforcement. I can do it.

Next, FIG. 2 shows the case where the present invention is used as a six-dot Braille display device.

Braille usually consists of six dots, three vertical dots and two horizontal dots, and symbols are determined by the combination of these six dots. In Japan, the size of each point is usually 1 mmφ, the distance between the centers of the points in the vertical direction is 2.2 mm, and the distance between the centers of the points in the horizontal direction is 2 mm.

A frame consisting of these six points is called a square, and Braille text is expressed by arranging these squares horizontally. The spaces between the squares were arranged so that the distance between the centers of adjacent points was 3 mm, and each line had 32 squares, so that the thick paper would stand out, so if a general document was translated into Braille, the amount of text would be enormous. .

Therefore, 6 points x 32 characters corresponding to the above protrusions
A single-column Braille display device was proposed in which 192 small holes were formed in a hard plate, and pins that moved up and down the holes were protruded from a plunger via a flexible pull wire. It requires 192 plungers to protrude from the hard board and align them as desired, making it impractical.
Improvement of this was requested.

The present invention has been made in response to the above demand.

In Figure 2, 1, 1', 1'' are the same as in Figure 1,
A pair of polarized piezoelectric ceramic thin plates 11 each having metallized electrode surfaces (not shown) formed on both main surfaces.
a, 11b, 11a', 11b', 11a'', 11b'' are shims 12, 12', 1 made of elastic metal thin plates.
Consists of a bimorph structure laminated with 2"
The structure has a plurality of drive pieces 1 by means of groove-like cuts provided forward from the base parts 1a, 1'a, 1''a.
b _-1 ,1b _-2 ,1b _-3 ...1'b _-o ,1'b _-1 ,1'b _-2 ,
1'b _-3 ...1'b _-o ,1"b _-1 ,1"b _-2 ,1"b _-3 ...
1" b _-o are provided protrudingly in a comb shape. 2 is a metallized electrode surface that is common to the other main surface of the piezoelectric bodies 1, 1', 1" having a bimorph structure formed in a comb shape. Seat surface 2 seated at 1a, 1′a, 1″a
1, 22, 23 are provided on both side walls, and the base has an open top surface. Of these seating surfaces, 22, 23 are stepped seats extending forward, so that the piezoelectric bodies 1, 1', 1 are seated on a base. '', gaps g ₁ , g ₂ in the height direction and differences g ₁₁ , g ₁₂ between the front end faces in the horizontal direction are formed, and three layers are formed.Next, 3 _-1 , 3 _-2 , 3 _-3 ... 3 _-o ,3' _-1 ,3' _{-
2,3' -3} ...3' _{- o} ,3''-1,3 _' '-2,3'' _-3 ...
3″ _-o are the drive pieces 1b _-1 to 1b _-o and 1′, respectively.
b _-1 ~ 1'b _-o , 1''b _-1 ~ 1''b _-o The pins implanted in the front end portions are shown, and all these pins are inserted through the corresponding small holes of the hard plate 4. The lengths of each group of 3 _-1 to 3' _-1 to 3' _-o are made different so that they face the upper end surface.

In the above configuration, the three-stage seating surface 2 of the base 2
Piezoelectric bodies 1, 1', seated in three stages 1, 22, 23,
Drive pieces 1b _-1 ~ 1b _-o , 1'b _-1 ~ protruding from 1''
Pins with a wire diameter of 1 mmφ were implanted in the same part of the front end of each of 1′b _-o , 1″b _-1 to 1″b _-o.The line connecting the center lines of _3-1 to 3 _-o and the front The line connecting the center lines of _{' -1} ~ 3' _-o , and the line connecting the center lines of 3' _-1 ~ 3' _-o and the center line of 3'' _-1 ~ 3'' _-o in front. Each
The distance corresponding to g ₁₁ and g ₁₂ is 2.2 mm, and the pins 3 _- on the drive pieces 1b _-1 , 1′b _-1 , 1″b _-1 of the first row are
₁ , 3′ _-1 , 3″ _-1 and the second row drive piece 1
b _-2 , 1'b _-2 , pin 3 _-2 on 1"b _-2 , 3' _-2 , 3" _-2
These pins are positioned at each point of one Braille character consisting of the six points described above by setting the distance between the lines connecting them to 2 mm. Therefore, each pin of the third row of actuating pieces and each pin of the fourth row of driving pieces are positioned in the same manner as before, and the pins of the second row of driving pieces 3 _-2 , 3' _-2 , 3'' _-2 and the _pins 3 - of drive pieces 1b _-3 , 1'b _-3 and 1''b _-3 of the third row, respectively.
By setting the distance between the lines connecting ₃ , 3' _-3 and 3'' _-3 to 3 mm, the pins for 2 characters are paralleled, and in this way, the pins for 32 characters per row are placed on each drive piece. For example, in the case of Figure 2, there are 8 rows, 3 layers, and a total of 24
Each driving piece makes up 4 Braille characters, and if 8 pieces of piezoelectric material formed in this way are arranged horizontally, 32 lines per line.
A total of 192 pins are obtained.

Therefore, the lead wires 1c, 1'c,
Voltage is selectively applied between one of the group 1″c and a common lead wire connected to the entire surface electrode on the back side and the conductive metal base 2 to curve the desired driving piece upward. If so, the pins of the selected driving pieces pass through the small holes in the hard plate and protrude upward to form Braille characters.
After reading this one line of 32 characters in Braille, all voltages are turned off and the protruding pins are pulled down to their original positions. Voltage is again applied to the desired lead wires to selectively protrude the pins and the next one is read. It represents 32 characters in a row, and in the same way, each row is represented in turn.

〔Effect of the invention〕

As described above, the comb-shaped piezoelectric drive device of the present invention can selectively drive a large number of strip-shaped drive pieces, so it can be used as a mechanical signal source for various relays and information transmission devices, and can be used as a compact device. In addition to simplifying the wiring, since each drive piece protrudes from a single base, it has the great effect of accurately operating without worrying about misalignment during assembly, especially when used in large numbers such as Braille display devices. It is very effective when driving a drive piece, and can be manufactured by pasting a pair of thin square plates of piezoelectric ceramic with metallized surfaces on both main surfaces via metal shims, or by using a piezoelectric element as a single piece. After reinforcing it with a thin metal plate, make a cut from one end using a diamond cutter or the like to form a drive piece, and then grind the metallized surface of the top layer at the base to insulate each drive piece. It is also excellent in terms of mass production.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a comb-shaped piezoelectric drive device of the present invention, and FIGS. 2A, B, and C show the piezoelectric drive device used in a Braille display device.
Fig. A is a top view, Fig. B is a side view taken in section along line A--I of Fig. A, and Fig. C is a front view. 1, 1', 1''... comb-shaped piezoelectric drive device, 1a,
1′a, 1″a...base, 1b group (1b _-1 to 1b _-o ,
1'b _-1 ~ 1'b _-o , 1''b _-1 ~ 1''b _-o , each group hereafter follows)...drive piece, group 111a...divided metal on one main surface Metalized surface, 111b'...Metalized surface of the other main surface, 1c group, 1d... Lead wire, 2... Base, 21, 22, 23... Seat surface, 3
Group...pin.

Claims (1)

[Scope of Claims] 1. A plurality of strip-shaped drive pieces are provided protruding from the base, and a metalized electrode surface is formed on one main surface of each drive piece divided so that the drive pieces do not conduct with each other, and a metallized electrode surface is formed on the other main surface of the drive piece. On the other hand, there is a comb-shaped piezoelectric drive device which is made of a comb-shaped piezoelectric body on which a common metallized electrode surface is formed on which all of the drive pieces are electrically connected, and which is configured to selectively curve the plurality of drive pieces. 2 A plurality of strip-shaped driving pieces are provided protruding from the base, and a metalized electrode surface is formed on one main surface so that each driving piece is divided so that they are not electrically connected to each other, and all driving pieces are arranged on the other main surface. A plurality of comb-shaped piezoelectric bodies each having a common metallized electrode surface that is electrically conductive are placed at the base of the other main surface on which a common metallized electrode surface is formed on a plurality of seating surfaces provided in a stepped manner on the base. A comb-shaped piezoelectric drive for braille display for blind people, which is configured to hold and fix braille pins on the front ends of drive piece groups of each piezoelectric plate, and to selectively curve said drive piece groups. Device.